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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a00fb231647daa3e0387c4fc7c78efe075ccb28beeac36459d3f2d3a1537df0' 
  AND token = 'xCrWDXLuxvSztk+ihBznkunLM9zmgWltwSRD+ntAePw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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