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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62949673483398c3fa6a1118b94f3fdcfbcb2a9ddf70c43fc933ce87e248a27c' 
  AND token = 'mcqgBh2Yf7rQzQFPhZtWg7E0Q3gLTEH4MyK2Zt7iTso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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