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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26da3c63c32ee8a0c5ca40ad17ed610b8a155f56f78aa45676cbcc2f7a183e8c' 
  AND token = 'AZj9k1VEGpTS3sAbFO2NKqXZFqCPvLj1gMILq3+Qki8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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