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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70e8554fe558df3f67ef47e7dfe74953d6802cec4feb87b3a52e293b06fd6c5' 
  AND token = 'pfSrWvuEfo0JazGu0zaf7Qyy3qFm0w8HzfHKRU7At60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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