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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5345436272fbf825e620c9e085cc0cc148183cc3f5f5ac46ab36656d169f5a8' 
  AND token = '9IjNtJ1iR/EVrbGSyLw3BK86py/TP9AXEYXvMNWr300=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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