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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f14f9ac12529aa297ce46c246cbe4a25582b516bcec728a411911ffa545d3a7' 
  AND token = 'B1SlS4XFt6FrSJyBL8Pfsx/1JIEeKW+jqIhAuUICL2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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