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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f4bb197758dff425368d80c0a906722c4f0a85c3a9b8623bd992228ab7d491' 
  AND token = '5Kbls2ZdC28ebCqdnEyRvj0b4LiiCOLEIa4myoPfouQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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