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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ccf8bd035ff6f912baeeb8385754d752ffcfdfab5fec3b9c2886e14f442b39b' 
  AND token = 'FhqjldOTTcfiIbp9s/NkrJ3qwRzNU4KON9N0cESbnFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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