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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe192b4117bbb1c40abc4ef96f4b2ec4d3f2a3b1c5879dfb282da14e6dba8ed9' 
  AND token = 'u5W01XSwxgg6gnTbm5m1SyFjkd042tzmeVrX3eK9Em8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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