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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceaa3b03fc236dd8ff8c88801aaad398547da4d87229583d2def3271fb53e5cf' 
  AND token = 'OhFTiJnMVxgdh/m2QN/ysZoLvcsVnSGasmi1v6l4MiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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