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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b8cd391d0e1b6cac9763eff2090f2e0f7fc9148d400604c7a336f08cea2776' 
  AND token = 'jeI/WHV6cdvRP40Iq9RJnV6/cZKTEoyznga6IGcXSfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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