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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58c0bd435de84afbf0ae7abb83bd539f96f4eaceef18889d132d74d31208c08' 
  AND token = 'Ei6BX8iyeP/mnmTypOQgIjm+gf/vG13wUdF5kXcBlzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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