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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c6185ab93428e6f08913b1a6acae19b84bbafd2975119f0dbeb601d54f1c0a' 
  AND token = 'JjezRhY9Y4+FkCJeqDQ2Af+mpIqpdUiCM+d1CeuuppM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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