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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '597fb25dce9449f6b3528e197493187aedce107520e9833fdc7ec21ae7c7c4ed' 
  AND token = 'A+a/7LSj2PbODbRs4/1bGYNPMZ6O1qH0HTyheEqR0JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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