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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a1128546d11a9c99ca99a6c0e4d6602d55c772ffc5f352e3cbd0e8b0d5248e' 
  AND token = 'R4HfZjxGBcBHAPfdqGfTcuDz/WA0fsZ42Kg77oj69tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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