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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2eb351ff8143dece35179cd62d78bc8f3b5574c2a9fffa52cc3e853da4bac2' 
  AND token = 'yrpLYIu5DKFFWyxK9QtSxvBSoxvGhw6coW4KIEMKXuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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