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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf105755ab5f15342aad59e02fc715118460c67863ae9a33d93962e10167508' 
  AND token = '2uF+cfDk3Y7nDnqwQ+W6eDua7VOgamvyrI/w6q2El0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}