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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ac796c1658e717691a026753c09325a515fe8b38ad3573a14c5cc7b39622b2' 
  AND token = 'sOK/4w2e9LKa4oPh42N+ILkCV3/2w1hhbF/pT4YuQVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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