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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b2e70615c05d3f7e8c78e8808c237874b4bf2d8a49b3499a1ce1d008b0b38c' 
  AND token = 'qrRdOh415LpH8mUpoH/C3hzStK5EbMNfCIgAJ99ttUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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