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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfbfc767b4964989b1324e32c05e690cf76fca5e31f5515b878f18aa7f840638' 
  AND token = '8oxIoFkMGLLZpZjCo6Yrr0LEI3YEXy0d6VJCGRj2MNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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