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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a2805fd9025a2b8185a50c2d5254193cad6f5163326ec633a0d5e3db09cbf24' 
  AND token = 'eNUEvr4rNmNZSoiAEia9qm5yEs5CC95Fk4MtR19dpMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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