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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6efbcfca1c2894a27601ec350f7ad33d5d4cbf9ecdc5dd81ad743128b868dd99' 
  AND token = '0rCrfS9m+qZyQ7RI6A66xxpzsyw3pRLqtD2ET/+7ri0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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