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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a672e7639918b7785247bcdc2d554a1d7c2e4d139fb5e1095c5652eefeea99' 
  AND token = 'JDy95Jdqfz9YwPo4oDtQ3D4TfM1/T35rjZkMyTkB8/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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