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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'defbb9cad3f1fc203edb20784d6ee2a1ac0c6582b644c0d2b589507bcb0bb0d0' 
  AND token = 'jK2b1dU98VxfCNmaGLl1EVfRN0knzKlWCk6Cn0AgIyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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