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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d4e2112862a536b71bea8e9d04caea84646042facca573cf094342d3c858ac' 
  AND token = 'pUaxzuBL1YMuBeeRd7ZL3mU2BXOu+ITW9MssQc/68qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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