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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56222e0eddda012c688d25dfb112a3dc004da426cf09810aef7d3a0884e28298' 
  AND token = 'yvoKwrio7ttbzhXInoq6qD61Bmm8RQKRDdj4q+lKbCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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