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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4a03fcb475ac035ba86a004cec34d243a6acef1c9e5cb41471061944f8234f' 
  AND token = 'A/rct8rd2J004YzeEiWSWAQDDj0lmxjOpoGgVCkfGwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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