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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4e09b079af6fbc871f05d74a7c49c7045494c7547739c19f8d27ee6f3dd55f6' 
  AND token = 'g/V1SrcHf6ogM0D3NyKlrUUcsa0ldot+ZTuFPJHjk98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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