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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca574b458fc0ee191387847892a0d0ac0c6432f46e15b4da46c16021264731d9' 
  AND token = 'lDPX844SvtPQ5pV6aYEzvUG9UUWM485nrlity1dX4wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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