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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c999f33334e9de002e52f7046d146e0f03ea6ebddb2cd914157a9807a979579c' 
  AND token = 'FuZtJRx7xP87ZMan6e+LqL7xtK1Lo3V+WFODF6CBVbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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