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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b3f8f0d85797a8583b80201ee233abd9cea89eddb114796ec9a650dff5a3ec' 
  AND token = 'ylzGSQC3g9i6YvpAj0kNHTxLOinlw0ddR2m2KNbEolM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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