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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509d009558f01fc8498f822aafa4f667a1d637b15169e7d47ae5b9be80aae5ce' 
  AND token = 'rzBlRrgTOBfmWpWFPIU+u4DlYygQ4NzXbQJqxu9zYrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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