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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093473d8cc95d635e6844499991ad69e6a5cfa5c3431dfc109ea05bafbcf8cbc' 
  AND token = '9fVk2LGllPLW1+ravUcA+zdtvt1T6/0q/siQULDXEHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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