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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23468cd12946259d9cc6b79d4e44141de6c2796b763b01ad5e9326ad505c6e9c' 
  AND token = 'G4qk796aXT88qCIeToFPa+5p94zWX4SM+MBpNjAxlrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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