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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74de30000fdec659938b8ad63fcc0287a887fb6dd6635050c52ac93f0941f368' 
  AND token = 'RCMglHjBhbplCWx8zhLRFWhDGqTl+eK1T4s7128uU40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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