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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e4954b5c61b281061bb8d5580938408fb62285cd0dd9c42e4ec150ec7d2e00' 
  AND token = 'OAkP/ajsueEtR+03BytomEp16WctDHjcITO8dMJ3q1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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