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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a2fd08241ac804989d26e810ca6c435d4954e1d62ada7f3c8313d1b802da87' 
  AND token = 'r+amVlyK3OoRLsXoSm2UZ8ybKSB6MYWVkY8BjT5dP9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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