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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48ea12ca5a485cde48da19afcf1ddf991dd380cfdc95005d300c97d0c8aead13' 
  AND token = '6ZhvViUdXaTVD4TefpK86btsMQjD/vGLbsQIwdbnVMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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