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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b872c0e9026e701572776cbe1ed06c6a0e1b31fc8250ab9f07acdd76300b342' 
  AND token = 'UmHymWWW8M2aoWkVTbl1vOKvPTcSjLxzGVdjGdZCPo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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