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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eeaee63e2eff07c366206a9a35032b3ba059d4981371cfc818d36d99f54b9ae' 
  AND token = 'mbdAxnie9e+2DURkF4cdbqJBAPALvbZYSgHIZkN9JjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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