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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79abf02bf0dc59dad10ac113480bd3d2c45e845a549493e44ba48bf479b7f3cd' 
  AND token = '97qxJykr29ZUcfzDGl2mDBf56jBzrGzyq+PpK4l5Ebw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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