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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b8e56dd83e09a2c4ac610a22faef6261f03d1d9b8e861913b9dd660894b1b4' 
  AND token = 'ey8Z6ypUOm24oklHgNGBp9xxW1ZDzDpcneXYQw5e9UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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