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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b43d21acd90d2a8f05ab2856643306494e5eb31f727642f10361b7afb0b1e2' 
  AND token = 'QR1eG2zUVyMuVRdpgf43TV0M1M8yhviNbMfwttYeL30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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