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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ee3dabe65eb62f697799bf2ebc9ad958313f503a7606c52f5fb1e3f283a4e8' 
  AND token = 'rlKMGZ057WesfAiyew0ayiS7+4wxyRIHMrRDB/yd/eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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