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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbbc859c0f17e9116783b827b968242c61437741a5be746d1e620c2069e61982' 
  AND token = '3qdbQvcAl7Ck9Bu/0y7LcPtNmWbbt2dE22cqtrVDres=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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