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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b2d770db566c5d2311010a975437a4b7091ed2c0363f925ee066c2230f3304' 
  AND token = 'ba8APDA4691avCmCYb8PY6MN6noMMcLr67s7O5xfcYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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