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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd79c4761eae58d323b634fc5bff9bc376f80c66543a5a389349b26d15b341b' 
  AND token = '9qFwNx+koh7PhMu2Y+n/9LVAqahdHpasyowfdVX7iUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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