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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae66cc5cf1ccdd94fbb1bb897193f1d7c0b10583b7a52a1414a37eb6285188b' 
  AND token = 'c0VOnrcylPii0HB+wBURoBeIeH+k4DpgrGy+gk/x7Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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