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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee1271770ed6406cb70e2b83ef0b6baabc797e8cb9a8608db5a2ca46eb31dc1' 
  AND token = '4uozq50WYm5c8GwWZ9XS11kjpNtblG5Hbkz/Da5/Tvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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