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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7062e53bf3aa902bd0e09efb9f7670f458270387122066a84ce540f94bc5a606' 
  AND token = 'f1Vtk8Cd4FYvSoTjW9Ni/F3kNRgZoPCYsDOp5h8koTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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