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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00f0e7ad60032a9bdc57fb2da73e129d4bd5a39d09c1789bd5c02de37ac90c2' 
  AND token = 'O2ff95nbEX5m2pvvcgf9DtyMV9yywkqBmRal07Iv2NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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