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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a541203d1cd0389fe1c8af24943613bf4879fc567b35455c1135b11697eda290' 
  AND token = 'w2M3JQvuKU6vbocRFOEhT1gi0rimyzG4J17IE1pgdpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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