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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d65442d00cf114a56827ff0889b1f14ae448bd051e2908633f2146e1cedb26' 
  AND token = '+MpsQryV0tg/jJcVqurjlfOMmFVrwZJ4AQCT8CtY+l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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