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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62bab93e194bb6c60406c7314c61b7cd5d1dd4d9eb15f772bcfe1b0faab651f4' 
  AND token = 'L+jmGLHArWytNGfkjOOWoX3tEhXP+LyLNnF79m2XcTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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