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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea823da6fbdd7953a0499d155a3e3de29482656877be81d7bbf58027f9fa5e7' 
  AND token = 'n9FEmM79C2ep1LPLFwEQzZj7DwtT8gHQ79NHHR+P+Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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