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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1160ab2e03c50cedb2da67fce2e63eb5ba96081d36f7d7833dc6d9ac0db278' 
  AND token = 'WmyAdHwFaAFP0Lhy4xvRzA5A1P92MBuhqd6/mtrvN/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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