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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd55fe5221a66dc43f5e2b247d43af3438b32c985ce5154bd6693f5d58210ba5d' 
  AND token = '0EANSmzG+8zaUtk+6KM0AKLaXjV2LQC08XEC4+MOe6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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