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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba1aaef3e942d1ed0b573a58da5882e17752cd429f2b9d69e975048588b9229' 
  AND token = 'cjddESAlXzD83e6gOy0JgA3dIulJi0/4eizHK3cXSH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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