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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16f614287245cb073f81b1e15223f745da795ae5723c457c38fb43b875623732' 
  AND token = '79PtjZww93ONcA2gxZq87oXJz6vNE1PHtxHF9eKi7q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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