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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5fa610d107bb6e5061065eaec95cdc9e14398db53e056d62053d33c87cfbd7' 
  AND token = 'p1c8bBzLUOgwaAk1y3FNALzvvagT1hYNx/n5SAZggW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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