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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552681dac01bdb004111df850f7d1e70858117cae7d20758e8a131c446ecbdfe' 
  AND token = '4AgC/S4y8UaFIFdn+HVdiC1759atSNyrD3G4mEA0qAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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