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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113f3c0a81830f39dab8d0e4610281e51f8eb2d6e3edc49be29b5b6a3461ea01' 
  AND token = '9KFJgRdixNUQLpvwW2KFq6R5yb5OCkwlGvpbg0tfJ60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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