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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15e0d948e7a968096854353527ffbc9c9965928d295a0aa6061f4080df1c2cb' 
  AND token = 'R8oja4PewihF7iiOaIsleI4Ee6+LCkxYfDDFkKyBAUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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