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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eb8a50884e239be82b4061d4f9303e2c0c72893f0f77f99cfc01ae25233cf4c' 
  AND token = '2WSGnKnvjs5F99c7vPBkeA6909UzGJTenyHhoerOOIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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